Ceramic Tiles - Methods of the test, Sampling and Basis of Acceptance, Part 9: Determination of crazing resistance - Glazed tiles (see IS 13630: Parts 1 to 15)

IS 13630 Part 9: Scope Summary

• Scope Definition: This part of IS 13630 covers specific requirements related to the design, testing, or analysis of structural elements or materials as defined in the standard. (Exact scope details are typically in Clause 1 or 2.1.)

• Rounding Off (IS 2:1960):
  All calculated or observed values must be rounded off following IS 2:1960 rules.

  • Retain the same number of significant digits as the specified value.
  • Ensures uniformity in reporting test/analysis results.

• Reference Standards:
  IS 13630 Part 9 derives methodologies and criteria from other relevant Indian Standards, ensuring consistency.

Key Points for Application:

Example: Rounding Off Rule (IS 2:1960)

If you need formulas or tables for a specific design aspect within Part 9, please specify the section or topic.

IS 13630 Part 9 – Definitions: Key Points

• Clause 2.1 specifies that definitions used in this standard align with those in ISO 13006:1998 for ceramic tiles, covering terms like classification, characteristics, and marking.

• The standard emphasizes rounding off test values per IS 2:1960, ensuring:

  • Rounded values maintain the same significant figures as specified.
  • This ensures consistency and clarity in reporting test results.

Summary of Key Specifications:

Practical Note:

When reporting test results (e.g., tile dimensions, strength), round the final value to the same decimal place or significant figures as the standard specifies.

flowchart LR
    A[Test/Analysis Result] --> B[Calculate or Observe Value]
    B --> C[Apply Rounding per IS 2:1960]
    C --> D[Final Value with Correct Significant Figures]
    D --> E[Compare with Standard Limits]

This ensures uniformity and compliance in quality assessment of ceramic tiles.

IS 13630 Part 9 references other standards and emphasizes rounding rules per IS 2:1960. Key points:

• Rounding Off (IS 2:1960):

  • Final test or analysis values must be rounded to the same number of significant figures as the specified value.
  • Example: If specified value = 12.3 (3 significant figures), round calculated value to 3 significant figures.

• Referenced Standards:

  • IS 13630 (Part 9): 2006 itself is the main reference.
  • Other related IS codes may be used for specific test methods or material properties, though not explicitly listed here.

No direct formulas or tables are provided in the references clause. For detailed calculations, refer to respective IS parts or codes related to design or testing.

Summary Table: Rounding Off per IS 2:1960

If you need formulas or tables from other parts of IS 13630, please specify.

IS 13630 Part 9: Apparatus Key Points

The standard primarily refers to the use of directly heated autoclaves for testing (Clause 4.2). While explicit formulas or tables for apparatus design are not detailed in the provided context, typical specifications for autoclaves under IS codes include:

Apparatus Specifications:

• Autoclave Pressure: Usually maintained at 1.2 to 1.5 MPa (approx. 12-15 bar).
• Temperature Control: Precise control around 180°C ± 2°C for curing.
• Capacity: Sized to accommodate standard test specimens without overcrowding.
• Material: Corrosion-resistant steel with safety valves and pressure gauges.

Rounding Off Test Results (Clause 5):

• Follow IS 2:1960 for rounding numerical test results.
• Retain the same number of significant figures as specified in the standard.

Typical Autoclave Setup (Mermaid.js)

flowchart LR
    A[Heating Element] --> B[Autoclave Chamber]
    B --> C[Pressure Gauge]
    B --> D[Temperature Sensor]
    B --> E[Safety Valve]
    B --> F[Test Specimens]

For detailed apparatus design, consult IS 13630 Part 9 full text or related IS codes on autoclave specifications.

IS 13630 Part 9: Test Specimens - Key Specifications

Autoclave Testing Procedure (Clause 6.2)

• Place specimens with air space between them.
• Gradually raise autoclave pressure over 1 hour to 750 ± 20 kPa.
• Maintain pressure for 2 hours.
• Turn off heat/steam, allow pressure to drop rapidly to atmospheric.
• Cool specimens in autoclave for 30 minutes.
• Remove and cool specimens on flat surface in lab atmosphere for another 30 minutes.

Examination (Clause 6.4)

• Inspect for crazing (avoid confusing with scratches or cracks).
• Record:
  • Tile description
  • Number of specimens
  • Number showing crazing
  • Description of crazing (text, drawing, or photo)

Rounding Off (IS 2:1960)

• Round final test values to the same significant figures as specified in the standard.

Summary Table: Autoclave Test Parameters

flowchart TD
    A[Place specimens with air space] --> B[Increase pressure to 750 ± 20 kPa over 1 hour]
    B --> C[Maintain pressure for 2 hours]
    C --> D[Turn off heat, rapid pressure drop]
    D --> E[Cool specimens in autoclave for 30 min]
    E --> F[Remove and cool in lab for 30 min]
    F --> G[Examine for crazing]

This procedure ensures consistent evaluation of tile durability under steam pressure conditions.

IS 13630 Part 9 lacks a dedicated "Procedure" clause but provides key guidance relevant to testing and rounding:

• Rounding Off (IS 2:1960): Final test or analysis results must be rounded off following IS 2:1960 rules, keeping the same significant digits as the specified value.

• Test Specimens (Clause 5): Specifies requirements for preparing specimens, essential for consistent testing.

• Autoclave Use (Clause 4.2): Testing may involve a directly heated autoclave as an alternative method.

Key Points for Procedure:

Rounding Rule Summary (IS 2:1960):

• If the digit to be dropped is >5, round up.
• If <5, round down.
• If exactly 5, round to the nearest even digit.

flowchart TD
    A[Perform Test] --> B[Calculate Result]
    B --> C{Round Off Result}
    C -->|Follow IS 2:1960| D[Final Value]
    D --> E[Compare with Specified Value]

For detailed test procedures, refer to related parts or referenced standards within IS 13630 series.

IS 13630 Part 9 — Expression of Results: Key Points

• Rounding Off:
  Final test or analysis results must be rounded according to IS 2:1960 ("Rules for rounding off numerical values").
• Significant Figures:
  The number of significant digits in the rounded result should match the significant digits of the specified value in the standard.

Summary of IS 2:1960 Rounding Rules

Practical Application:

• If specified value = 12.3 (3 significant digits), result = 12.345 → rounded to 12.3
• If specified value = 0.0050 (2 significant digits), result = 0.00503 → rounded to 0.0050

flowchart TD
    A[Test/Analysis Result] --> B{Check Specified Value's Sig. Digits}
    B --> C[Round off result as per IS 2:1960]
    C --> D[Final Rounded Result]

This ensures consistency and comparability of reported results with standard requirements.

IS 13630 Part 9: Test Report Specifications for Decorated & Relief Surfaced Tiles

Key Points for Test Report (Clause 6.4):

• Test Specimen Examination:

  • Inspect specimens for crazing (avoid confusing with scratches or cracks).

• Test Report Must Include:

  • a) Description of the tile.
  • b) Number of test specimens.
  • c) Number of specimens showing crazing.
  • d) Description of crazing (text, drawing, or photograph).

Rounding Off Results (per IS 2:1960):

• Final test values must be rounded to the same number of significant figures as specified in the standard.

Summary Table for Test Report Content

Additional Notes:

• Use a directly heated autoclave if applicable (Clause 4.2).
• Crazing examples are illustrated in IS 13630 Part 9 Fig.1 for visual reference.

flowchart TD
    A[Test Specimens] --> B[Examine for Crazing]
    B --> C{Crazing Present?}
    C -->|Yes| D[Record Number & Description]
    C -->|No| E[Record as No Crazing]
    D --> F[Prepare Test Report]
    E --> F
    F --> G[Include Tile Description, Specimen Count, Crazing Details]

This concise format ensures compliance with IS 13630 Part 9 test reporting requirements.